[#absl-optional_ref-0c-2constructor-04]
= xref:absl.adoc[absl]::xref:absl/optional_ref-0c.adoc[optional_ref]::optional_ref
:relfileprefix: ../../
:mrdocs:

Constructs an `optional_ref` from a pointer, where null means absent.

== Synopsis

Declared in `<absl/types/optional_ref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
optional_ref(T* input);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *input*
| The pointer to refer to, or null for an empty reference.
|===


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